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big: Rat test improvements

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R=gri
CC=golang-dev
https://golang.org/cl/1270041
This commit is contained in:
Evan Shaw 2010-05-24 16:38:41 -07:00 committed by Robert Griesemer
parent d14baee96e
commit 751fc425ee
1 changed files with 78 additions and 86 deletions
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164
src/pkg/big/rat_test.go
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@ -9,22 +9,33 @@ import "testing"
type setStringTest struct { type setStringTest struct {
in, out string in, out string
ok bool
} }
var setStringTests = []setStringTest{ var setStringTests = []setStringTest{
setStringTest{"0", "0"}, setStringTest{"0", "0", true},
setStringTest{"1", "1"}, setStringTest{"-0", "0", true},
setStringTest{"-1", "-1"}, setStringTest{"1", "1", true},
setStringTest{"2/4", "1/2"}, setStringTest{"-1", "-1", true},
setStringTest{".25", "1/4"}, setStringTest{in: "r", ok: false},
setStringTest{"-1/5", "-1/5"}, setStringTest{in: "a/b", ok: false},
setStringTest{in: "a.b", ok: false},
setStringTest{"-0.1", "-1/10", true},
setStringTest{"-.1", "-1/10", true},
setStringTest{"2/4", "1/2", true},
setStringTest{".25", "1/4", true},
setStringTest{"-1/5", "-1/5", true},
setStringTest{"884243222337379604041632732738665534", "884243222337379604041632732738665534", true},
setStringTest{"53/70893980658822810696", "53/70893980658822810696", true},
setStringTest{"106/141787961317645621392", "53/70893980658822810696", true},
setStringTest{"204211327800791583.81095", "4084226556015831676219/20000", true},
} }
func TestRatSetString(t *testing.T) { func TestRatSetString(t *testing.T) {
for i, test := range setStringTests { for i, test := range setStringTests {
x, _ := new(Rat).SetString(test.in) x, ok := new(Rat).SetString(test.in)
if x.String() != test.out { if ok != test.ok || ok && x.String() != test.out {
t.Errorf("#%d got %s want %s", i, x.String(), test.out) t.Errorf("#%d got %s want %s", i, x.String(), test.out)
} }
} }
@ -92,94 +103,75 @@ func TestRatCmp(t *testing.T) {
type ratBinFun func(z, x, y *Rat) *Rat type ratBinFun func(z, x, y *Rat) *Rat
type ratBinArg struct { type ratBinArg struct {
x string x, y, z string
y string
out string
} }
func testRatBin(t *testing.T, f ratBinFun, a []ratBinArg) { func testRatBin(t *testing.T, i int, name string, f ratBinFun, a ratBinArg) {
for i, test := range a { x, _ := NewRat(0, 1).SetString(a.x)
x, _ := NewRat(0, 1).SetString(test.x) y, _ := NewRat(0, 1).SetString(a.y)
y, _ := NewRat(0, 1).SetString(test.y) z, _ := NewRat(0, 1).SetString(a.z)
expected, _ := NewRat(0, 1).SetString(test.out) out := f(NewRat(0, 1), x, y)
out := f(NewRat(0, 1), x, y)
if out.Cmp(expected) != 0 { if out.Cmp(z) != 0 {
t.Errorf("#%d got %s want %s", i, out, expected) t.Errorf("%s #%d got %s want %s", name, i, out, z)
}
} }
} }
var ratAddTests = []ratBinArg{ type ratBinTest struct {
ratBinArg{"0", "0", "0"}, x, y string
ratBinArg{"0", "1", "1"}, sum, prod string
ratBinArg{"-1", "0", "-1"},
ratBinArg{"-1", "1", "0"},
ratBinArg{"1", "1", "2"},
ratBinArg{"1/2", "1/2", "1"},
ratBinArg{"1/4", "1/3", "7/12"},
ratBinArg{"2/5", "-14/3", "-64/15"},
ratBinArg{"4707/49292519774798173060", "-3367/70976135186689855734", "84058377121001851123459/1749296273614329067191168098769082663020"},
ratBinArg{"-61204110018146728334/3", "-31052192278051565633/2", "-215564796870448153567/6"},
} }
func TestRatAdd(t *testing.T) { var ratBinTests = []ratBinTest{
testRatBin(t, (*Rat).Add, ratAddTests) ratBinTest{"0", "0", "0", "0"},
ratBinTest{"0", "1", "1", "0"},
ratBinTest{"-1", "0", "-1", "0"},
ratBinTest{"-1", "1", "0", "-1"},
ratBinTest{"1", "1", "2", "1"},
ratBinTest{"1/2", "1/2", "1", "1/4"},
ratBinTest{"1/4", "1/3", "7/12", "1/12"},
ratBinTest{"2/5", "-14/3", "-64/15", "-28/15"},
ratBinTest{"4707/49292519774798173060", "-3367/70976135186689855734", "84058377121001851123459/1749296273614329067191168098769082663020", "-1760941/388732505247628681598037355282018369560"},
ratBinTest{"-61204110018146728334/3", "-31052192278051565633/2", "-215564796870448153567/6", "950260896245257153059642991192710872711/3"},
ratBinTest{"-854857841473707320655/4237645934602118692642972629634714039", "-18/31750379913563777419", "-27/133467566250814981", "15387441146526731771790/134546868362786310073779084329032722548987800600710485341"},
ratBinTest{"618575745270541348005638912139/19198433543745179392300736", "-19948846211000086/637313996471", "27674141753240653/30123979153216", "-6169936206128396568797607742807090270137721977/6117715203873571641674006593837351328"},
ratBinTest{"-3/26206484091896184128", "5/2848423294177090248", "15310893822118706237/9330894968229805033368778458685147968", "-5/24882386581946146755650075889827061248"},
ratBinTest{"26946729/330400702820", "41563965/225583428284", "1238218672302860271/4658307703098666660055", "224002580204097/14906584649915733312176"},
ratBinTest{"-8259900599013409474/7", "-84829337473700364773/56707961321161574960", "-468402123685491748914621885145127724451/396955729248131024720", "350340947706464153265156004876107029701/198477864624065512360"},
ratBinTest{"575775209696864/1320203974639986246357", "29/712593081308", "410331716733912717985762465/940768218243776489278275419794956", "808/45524274987585732633"},
ratBinTest{"1786597389946320496771/2066653520653241", "6269770/1992362624741777", "3559549865190272133656109052308126637/4117523232840525481453983149257", "8967230/3296219033"},
ratBinTest{"-36459180403360509753/32150500941194292113930", "9381566963714/9633539", "301622077145533298008420642898530153/309723104686531919656937098270", "-3784609207827/3426986245"},
} }
func TestRatBin(t *testing.T) {
for i, test := range ratBinTests {
arg := ratBinArg{test.x, test.y, test.sum}
testRatBin(t, i, "Add", (*Rat).Add, arg)
var ratSubTests = []ratBinArg{ arg = ratBinArg{test.y, test.x, test.sum}
ratBinArg{"0", "0", "0"}, testRatBin(t, i, "Add symmetric", (*Rat).Add, arg)
ratBinArg{"0", "1", "-1"},
ratBinArg{"-1", "0", "-1"}, arg = ratBinArg{test.sum, test.x, test.y}
ratBinArg{"-1", "1", "-2"}, testRatBin(t, i, "Sub", (*Rat).Sub, arg)
ratBinArg{"1", "1", "0"},
ratBinArg{"1/2", "1/3", "1/6"}, arg = ratBinArg{test.sum, test.y, test.x}
ratBinArg{"1/4", "1/3", "-1/12"}, testRatBin(t, i, "Sub symmetric", (*Rat).Sub, arg)
ratBinArg{"2/5", "-14/3", "76/15"},
ratBinArg{"4707/49292519774798173060", "-3367/70976135186689855734", "250026291202747299816479/1749296273614329067191168098769082663020"}, arg = ratBinArg{test.x, test.y, test.prod}
ratBinArg{"-27/133467566250814981", "-18/31750379913563777419", "-854857841473707320655/4237645934602118692642972629634714039"}, testRatBin(t, i, "Mul", (*Rat).Mul, arg)
ratBinArg{"27674141753240653/30123979153216", "-19948846211000086/637313996471", "618575745270541348005638912139/19198433543745179392300736"},
} arg = ratBinArg{test.y, test.x, test.prod}
testRatBin(t, i, "Mul symmetric", (*Rat).Mul, arg)
func TestRatSub(t *testing.T) {
testRatBin(t, (*Rat).Sub, ratSubTests) if test.x != "0" {
} arg = ratBinArg{test.prod, test.x, test.y}
testRatBin(t, i, "Quo", (*Rat).Quo, arg)
}
var ratMulTests = []ratBinArg{
ratBinArg{"0", "0", "0"}, if test.y != "0" {
ratBinArg{"0", "1", "0"}, arg = ratBinArg{test.prod, test.y, test.x}
ratBinArg{"-1", "0", "0"}, testRatBin(t, i, "Quo symmetric", (*Rat).Quo, arg)
ratBinArg{"-1", "1", "-1"}, }
ratBinArg{"1", "1", "1"}, }
ratBinArg{"1/2", "1/2", "1/4"},
ratBinArg{"1/4", "1/3", "1/12"},
ratBinArg{"2/5", "-14/3", "-28/15"},
ratBinArg{"-3/26206484091896184128", "5/2848423294177090248", "-5/24882386581946146755650075889827061248"},
ratBinArg{"26946729/330400702820", "41563965/225583428284", "224002580204097/14906584649915733312176"},
ratBinArg{"-8259900599013409474/7", "-84829337473700364773/56707961321161574960", "350340947706464153265156004876107029701/198477864624065512360"},
}
func TestRatMul(t *testing.T) {
testRatBin(t, (*Rat).Mul, ratMulTests)
}
var ratQuoTests = []ratBinArg{
ratBinArg{"0", "1", "0"},
ratBinArg{"0", "-1", "0"},
ratBinArg{"-1", "1", "-1"},
ratBinArg{"1", "1", "1"},
ratBinArg{"1/2", "1/2", "1"},
ratBinArg{"1/4", "1/3", "3/4"},
ratBinArg{"2/5", "-14/3", "-3/35"},
ratBinArg{"808/45524274987585732633", "29/712593081308", "575775209696864/1320203974639986246357"},
ratBinArg{"8967230/3296219033", "6269770/1992362624741777", "1786597389946320496771/2066653520653241"},
ratBinArg{"-3784609207827/3426986245", "9381566963714/9633539", "-36459180403360509753/32150500941194292113930"},
}
func TestRatQuo(t *testing.T) {
testRatBin(t, (*Rat).Quo, ratQuoTests)
} }